Draft-regulating device.



F. M. DAVIDSON.

DRAFT REGULATING DEVICE.

APPLICATION FILED 001 .41 1912.

1,123,108, Patented Dec.29,1914.

lnE NORRIS PETERS CD11 PHOTO-LITHa, WASHINGTON, D. Cv

FRANK IVI. DAVIDSON, OF KIRWIN, KANSAS.

DRAFT-REGULA'IING DEVICE.

Specification of Letters Patent.

Patented Dec. 29, 1914.

Application filed October 4, 1912. Serial No. 723,932.

To all whom it may concern Be it known that I, FRANK M. DAVIDSON, acitizen of the United States, residing at Kirwin, in the county ofPhillips and State of Kansas, have invented new and useful Improvementsin Draft-Regulating Devices, of which the following is a specification.

This invention relates to draft regulating devices and the object of theinvention is the provision of simple and efficient mecha nism forcontrolling the exhaust from the cylinders of the steam engine so thatinstead of carrying all of the exhaust out through the smoke box andsmoke stack, a portion of it may be deflected direct to the atmosphere,whereby the draft may be reduced or increased, as desired. This resultsin many advantages, such as reducing the draft to a minimum when thefurnace door is open so as to avoid relatively large and sudden changesin temperature which produces leaky lines and cracked fire box sheets. Adevice of this character also permits of considerable reduction in thefuel consumption.

Further objects of this invention will appear as the following specificdescription is read in connection with the accompanying drawing, whichforms a part of this application, and in which Figure 1 is a sideelevation. Fig. 2 is a sectional view through the controlling valve.

Referring more particularly to the draw ing, 1 represents an ordinarytraction engine boiler having the steam cylinder 2 mounted thereon andconnected to the exhaust chamber 3 by a pipe 4:. A pipe 5 leads out ofthe exhaust chamber and is in communication with the exhaust nozzle 6arranged in the smoke box and adapted to direct the exhaust steam to thestack 7. The pipe 5 includes a Tunion 8 which is connected to a valvedcasing 9 by a pipe 10. The valved casing has mounted therein and in anextension 11 thereof, a valve seat member 12 provided with a board 13controlled by a slide valve 15. One end of the casing is closed by aplug 16 and the opposite end of the casing has attached thereto theextension 11 which has its end closed by a plug 17 provided with apacking gland 18 through which the operating rod 19 passes. Thisoperating rod is connected to the slide valve 15 and has a rack 20adjacent its outer end adapted to engage a bearing 21 for holding thevalve in adjusted position. The terminal of the rod 19 is formed into anoperating handle 22. The opposite side of the casing from the pipe 10has secured thereto a pipe 23 which leads directly to the atmosphere.

In the operation of the device when it is desired to decrease the draftthe valve is shifted to the position shown in Fig. 2 which permits acertain amount of the exhaust steam from the tank 3 to escape throughthe valve casing and pipe 23 to the atmosphere. IV hen maximum draft isrequired the valve is thrown to closed position and locked in suchposition by the rack 20 engaging the bar 21.

What is claimed is 1. In a valve structure for draft regulating devices,a casing having alined inlet and exhaust passages therein, a sleevecarried by the casing and arranged at right angles thereto, and anelongated member arranged within the sleeve and having one of its endsextending into the casing, the said member having its upper surfaceflat, the said extending end of the member having an opening extendingtransversely therethrough and registering with the exhaust passage, a

valve slidably arranged within the casing and the sleeve and having afiat under surface engaging the flat upper surface of the member, thesaid valve being operable over the opening in the member, whereby tocontrol communication between the inlet and exhaust passages, and meansfor operating the valve.

2. In a valve structure for draft regulating devices, a valve casinghaving inlet and exhaust passages therein, a sleeve carried by thecasing, a member removably arranged within the sleeve and having a flatupper surface, the said member having one of its ends extending into thecasing and having an opening registering with the exhaust passage, avalve slidably mounted upon the upper surface of the member, andoperable over the opening in the member,

to control communication between the ex- In testimony whereof I afiix mysignature haust and inlet passages, means extending in presence of twoWitnesses. through the sleeve and engaging the mem- FRANK M. DAVIDSON.ber, whereby to hold the latter from move- Witnesses:

5 ment during the operation of the valve, and JOHN M. GRAY,

means for operating the valve. ALEX; BARRON.

Copies 01 this patent may be obtained for five cents each, by addressingthe Commissioner 0! Patents,

Washington, D. C.

